CLRC663 datasheet(71/177 Pages) NXP

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NXP Semiconductors

CLRC663

High performance multi-protocol NFC frontend CLRC663 and CLRC663 plus

Bit

Symbol

ValuesAfterColl

RxAlign

NoColl

RxLastBits

Access

rights

r/w

Table 75. RxBitCtrl register (address 0Ch);

Bit

Symbol

Description

ValuesAfter Coll If cleared, every received bit after a collision is replaced by a zero. This function is needed

for ISO/IEC14443 anticollision

6 to 4

RxAlign

Used for reception of bit oriented frames: RxAlign defines the bit position length for the first

bit received to be stored. Further received bits are stored at the following bit positions.

Example:

RxAlign = 0h - the LSB of the received bit is stored at bit 0, the second received bit is stored

at bit position 1.

RxAlign = 1h - the LSB of the received bit is stored at bit 1, the second received bit is stored

at bit position 2.

RxAlign = 7h - the LSB of the received bit is stored at bit 7, the second received bit is stored

in the following byte at position 0.

Note: If RxAlign = 0, data is received byte-oriented, otherwise bit-oriented.

NoColl

If this bit is set, a collision will result in an IntegErr

2 to 0

RxLastBits

Defines the number of valid bits of the last data byte received in bit-oriented

communications. If zero the whole byte is valid.

Note: These bits are set by the RxDecoder in a bit-oriented communication at the end of the

communication. They are reset at start of reception.

Table 76. RxBitCtrl bits

9.6.4 RxColl

Receiver collision register.

Bit

Symbol

CollPosValid

CollPos

Access

rights

Table 77. RxColl register (address 0Dh);

Bit

Symbol

Description

CollPos

Valid

If set to 1, the value of CollPos is valid. Otherwise no collision is detected or the position of the

collision is out of the range of bits CollPos.

6 to 0

CollPos

These bits show the bit position of the first detected collision in a received frame (only data bits

are interpreted). CollPos can only be displayed for the first 8 bytes of a data stream.

Example:

00h indicates a bit collision in the 1st bit

01h indicates a bit collision in the 2nd bit

08h indicates a bit collision in the 9th bit (1st bit of 2nd byte)

Table 78. RxColl bits

CLRC663

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Product data sheet

Rev. 5.3 — 3 January 2024

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